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以北京市延庆县水土保持科技示范园不同水保措施的径流小区为对象,研究了水保措施对土壤水稳性大团聚体的影响。主要研究结果为:(1)仅采用工程措施会破坏土壤水稳性大团聚体,特别是粒径为5~8mm的水稳性大团聚体,并降低土壤大团聚体的水稳定性;采用植物措施后可以明显增加土壤水稳性大团聚体的含量,特别是增加了2~5mm和5~8mm粒径的水稳性大团聚体的含量,并明显提高土壤大团聚体的水稳定性;(2)土壤有机质对土壤团聚体的形成具有明显的促进作用,有机质含量与土壤水稳性大团聚体的含量和大团聚体的水稳定性之间均具有显著的相关性。研究结果对水土保持工作具有一定的参考意义。
Taking the runoff plot with different soil and water conservation measures in Yanqing County Soil and Water Conservation Technology Demonstration Park in Beijing as an example, the effects of soil and water conservation measures on soil water-stable macroaggregates were studied. The main results are as follows: (1) Only using engineering measures can destroy large water-stable soil aggregates, especially water-stable large aggregates with particle size of 5 ~ 8mm and reduce the water stability of large soil aggregates; After plant treatment, the content of soil water-stable macroaggregates, especially the content of water-stable macroaggregates with particle sizes of 2-5 mm and 5-8 mm increased, and the water stability of soil macroaggregates obviously increased ; (2) Soil organic matter has a significant role in promoting the formation of soil aggregates. There is a significant correlation between organic matter content and the content of water-stable macro-aggregates and the water stability of macro-aggregates. The results of this study have certain reference value to soil and water conservation.